All posts tagged foliation

I’ve neglected to update the blog for awhile, but I have good reasons. The last two weekends I have been out with classes playing with rocks, and the time between those trips has been packed with exams and labs that have consumed my spare time and sanity. I’ve come to break my silence with a post of pictures from the trip my Structure class took to Baraboo, Wisconsin this past weekend. I have a bunch of pictures from my Volcanology trip the week prior too, but those are more to sort through at the moment. Maybe this weekend.

Anyway, most of the weekend my phone was dead and my phone is what I used to take pictures, so I didn’t get a lot of pictures. I didn’t even get pictures of all the things I wanted to get pictures of (like this really awesome fold we visited). Apart from that, the trip was very busy and rushed due to the need to get strike and dip data everywhere and search for jointing and pressure solutions in the rocks we were surveying, not a whole lot of time for pictures.

These are from our first stop at Larue Quarry and our first introduction to what would dominate our trip, the Baraboo Quartzite.

This is an image from Ableman’s Gorge where the bedding in this quartzite has not only been titled vertically, but they contain beautifully preserved ripple marks.

A short way from Ableman’s Gorge you find the famous Van Hise Rock. Upon this rock you will find all kinds of cool shit (in a worlds colliding kind of way), but my favorite thing were these en echelon vein arrays that could be found throughout. These sigmoidal structures betray the history of stresses in the rock.

These were taken in a road outcrop that exhibited amazing crenulations. This was my first time seeing something like this in person and they’re pretty incredible. They look like Da Vinci paintings with no subject.

At the same outcrop you find these foliations with a sigmoidal shape. These were formed as the block above this layer moved to the right (and slightly into the screen) and the one below to the left (and out of the screen).

Here, once again at the same outcrop, we find ripple marks spectacularly preserved in the quartzite.

In the cliffs above Devil’s Lake you will find this feature; an unconformity that represents 1.1 billion years of missing time.

… and finally, our fearless leader talking about the history of Devil’s Lake. A man both loved and hated during the trip. Good dude.